Define "illuminate/*" dependency requirement

[klimov-paul]

It is hard to tell whether this is intentional or not, but composer.json of this library does not contain any "illuminate/*" library constrait at all.

This might be flexible of course, but it is hard to determine, which Laravel version can match the particular version of this library.

I suggest the following line should be added to the composer.json:

{
    ...
    "require": {
        "illuminate/support": "^7.0 || ^8.0",
        ...
    }
}

[driesvints]

That's because it's meant to be used in conjunction with Jetstream. But feel free to pr those dependencies.